The Szpilman Award is awarded to ephemeral art works - or in other words: works that exist only for a moment or a short period of time.

The winner of the 2011 award has just been announced, and the award goes to the Slovakian artist Jaroslav Kyša.

Kyša is awarded for the work 'The Barrier' in which he uses doves to create disturbance in the city of London by secretly scattering their favorite fodder in front of shops or across busy streets.

Another brilliant work (and a personal favorite) among the top six nominees is David Horvitz's Public Access (PDF link).
David Horvitz drove up the coast of California and stopped at about 50 different coastal access points along the trip where he took a picture of the ocean with himself within the frame of the photograph. Using different user accounts and IP's, he then he uploaded the pictures to the Wikipedia-articles of each of these places.